Colored rubber products and a process of producing them



Patented Feb. 28, 1939 PATENT iOFjFICE -ooLoREn-RUB ER-PRoDUcTs AND A 'rn'oosss F,v PRODUCING i THEM -Ernst Fischer, aOfienbacheon-the-Main,

Ger-

many, assignorto General Aniline Works, Inc.,

New York, N. Y., aoorporation of Delaware -No Drawing. Application-July'23,1936, Serial No. @2253. I n Gerinany;July 2 6, 1935 The present invention relates to colored rubber products andjto aprocess'of producing them.

I haveffound that rubber products (which term is meant to include naturalrubber aswell as: the synthetic. products which have .a. constitution and properties :similar to those of natural rubber, as for example-polymerization products of butadiene hydrocarbons such as butadiene or isoprene) can be colorediclear violet to blue. shades having very good iastness properties by incorporating with the rubber. products or mixtures containing them, prior to vulcanization, -.water'--.i-nsoluble mono-.azo-

.tdyestufi'siof. the general. formula:

Alkyl. 0

wherein R1 stands fora member of the group consisting of hydrogen alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, Y 'fOI a member of the group consisting of hydrogen, halogen and alkoxy, X1 for a member of the group consisting of hydrogen, alkyl ralkoxy and the group NI-I.CO.R2, X2 for a membenof the group consisting of alkoxy and thegroup NH.CO.R2, always one of the two substituents$X1 and X2 being the group NH.CO.R2, and wherein R2 stands for a member of the group consisting of alkyl,

benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical.

' The dyestuffs are adapted for the different kinds of hot and cold .vulcanizationprocesses. By reason of the said dyestufis being practically insoluble in rubber, they do not bleedrwhen the rubber :are distinctly. superior torthe, dyestuffs. disclosed 10 in German Patent No. 601,254.

For coloring rubber products blue and violet shades having good fastness properties there could'chither to:sbegused only: the disazo-dyestufifs described in German -Patent- No. 604,299. 'The possibility of obtaining the sameefiects by means of mono-azo-dyestufisconstitutes a valuable advance in the art, since monoazo-dyestufis can be prepared on a technical scale with greater certainty in a uniform manner which guarantees the valuable properties of the dyeings.

The following examples serve toillustrate the invention, but they are not intended to limit it thereto; the parts are by weight:

(1) A rubber mixture is prepared from 100 parts of, crepe rubber, 1 part of stearic acid, 2.6 parts of sulfur,'5 parts of zinc white, 1 part of mercapto-benzothiazol, 0.2 part of hexamethylenetetramine, 60 parts of calcium carbonate, 0.6 part of ozocerite, 10 parts of lithopone, 5 parts of titanium dioxide, and 2 parts of the dyestuff obtainable by couplingndiazotized 1-amino-2.5- diethoxy- 4 benzoylaminobenzene with 2.3 hydroxy naphthoyl-1-amino-benzene-4- (carbonyl 1" amino-2".5 dimethoxybenzene) The mixture is vulcanized in a vulcanization press for 12 minutes at a steam pressure of 3 atmospheres above atmospheric pressure. Thereis obtained a blue vulcanizate of very good properties of fastness.

(2) A rubber mixture is prepared in the usual manner-from crepe rubber, the usualadmixtures and 2 parts of the dyestuff obtainable by coupling diazotized l-amino-2-methoxy-5-methyl 45 4-benzoylaminobenzene with 2.3-hydroxynaph- Item 8 thoyl-l-aminobenzene 4' carbonylaminoben- NRCO-OuHs zene. The mixture is vulcanized in the cold by immersing it for 8 seconds in a solution of 3 parts of sulfur chloride in 97 parts of benzine. There is obtained a violet vulcanizate which is, as to its OIHIO fastness properties, very similar to that described N in Example (1). 1LT

The following table illustrates a series of dyestuffs which may be substituted for those of Ex- OH GONE-0Q CH: amples 1 and 2 and. which dye the vulcanizates very fast tints. CH

Dyestuff from: OO.NH

Diazo compound ol- Coupled with Shade 2,B-hydroxynaphthoyl-l-amiuobenzeue- 1 1-amino-2,5'diethoxyi-phenacetylaminobenzene. -4-(carbonyl-l-amino-2"-methyl-4"-chlorobenzene)- Blue.

2 l-amino-2-methoxy-4-acetaminobenzene -4-carbonylamino-benzene Violet.

3 1-amino-2,5-diethoxy-4-hexahydrobenzoylaminobenzene do 1 Reddish blue.

4 l-amin0-2,5-diethoxy-4-benzoylaminobenzene -4-carboxylic acid amide D0.

5 (YO -carboxylic acid ethyl amide Do.

6 -4-carboxylic acid methyl amide D0.

7 -4'-carboxylie acid benzyl-amide Blue.

8 -4-carboxylic acid cyclohexylamide Do.

a one 10 -4'-carbonylaminobenzene Blue. 11 l-amino-2.5-dimethoxy-4-benzoylaminobenzenedo Reddlsh blue. 12 1-amino-2,4-dimethoxy-5-beuzoylaminobenzene. do Violet. 13 l-amino-2,4-diethoxy-5-benzoylamin0benzene do Do. 14 Lamina-2,5-diethoxy-4-benzoylaminobenzene -4'-(carbonyl-l"-amin0-2,4"-dioh1orobenzene) Blue. 15 d $-(carll;onyl-lx-amino-gx-nfieithy-3"-eh1orobenzene)- g0. IiiEiitbfifitliwfifiifiil imfiib332333 D3 -4-(carbonyl-l-amino-4-methoxybenzene Do: 19 -4'-(carbonyl-2-amino-naphthalene) Do. 20 l-amino-2-methoxy-5-methyl-4-benzoylaminobenzene -4-(carbonyl-l"-amino-2- hlorobenzen Violet. 21 l-amino-2,5-dimethoxy-4-benzoylaminobenzene -4'-carboxylic aoid-cyclohexylamide- Reddish blue. 22 Lamina-2,5-diethoxy-4-(2-methoxy-) benzoylaminobem -4'-carboxy1ic acid amide Violet.

zone 23 l-amino-2,5'diethoxy-4-(2-chloro-) benzeylaminoben- -4'-(carbonyl-1"-amino-2f'-chlorobenzene) Reddlsh blue.

zene 24 1-amino-2,6-diethoxy-4-(4-ethoxy-) benzoylaminoben- -4'-(carbonyl-1"-amino-2"-chlorobenzene Violet.

zene 25 l-amino-zfi-diethoxyi-(3-methyl-) benzoylaminoben- -4'-carhonylaminobenzene Reddish blue.

zene 26 l-amino-2,5-diethoxy-4-(2-naphthoy1-) aminobenzene -4-carboxylic acid benzylamide Blue. 27 l-amin0-2,6-diethoxy-4-benzoylaminobenzene 6-bromo-2,3-hydroxynaphthoyl-1-aminobenzene-4-car- Reddish blue.;

bonyl-aminobenzene 28 do 6-methoxy-2, 3-hydroxy-naphth0yl-1'-aminobenzene-4- Blue.

(carbonyl-l-amino-2-methoxybenzene) For the. purpose of clarity some of the dyestufis Item 9 described in the foregoing table are set forth in structural formulae:

Item 1 oo,H. NH.O0.0Hg.OnH;

C1H;O

f CzHsO OH 00 NH-EH N OH:

H: OH OO.NH

o0.NH

0o.NH 01 Item 22 Item 011.0

(3H1 E NH.OOCHCH1GH1 NH.O0

/OC1H5 00:11;

02 50 OzHgO N N H a II N N (nOH O0.NH.O1E; OH CONH:

O0.NH OO.NH

0H Uoonmomoim 00.NH I claim:

1. The process of producing rubber products which are colored blue to violet shades which comprises mixing a rubber product with a waterinsoluble mono-azo-dyestufi corresponding to the following general formula:

alkyl-O OH CO.NH.R1

OO.NH

' wherein R1 stands for a member of the group and wherein R2 stands for a member of the group consisting of alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, and then vulcanizing the mixture.

2. The process of producing rubber products which are colored blue to violet shades which comprises mixing a rubber product with a waterinsoluble mono-azo-dyestufl corresponding to the following general formula:

NH. C O. CQHB alkyLO I OH O O .NH-R] C (LNH wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, Y for a member of the group consisting of hydrogen, halogen and alkoxy, and

X1 for a member-of'thegroup consisting of hydrogen; alkyl and 'alkoxy, and then vulcanizing themixture. i l g 1 3. Rubber products which are colored blue to violet shades containing a water-insoluble monoazo-dyestufl of the following'general formula:

OH CO.NH.R

wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical, Y for a member of the group consisting of hydrogen, halogen and alkoxy, X1 for a member of the group consisting of hydrogen, alkyl, alkoxy and the group -NH.CO.Rz, X2 for a member of the group consisting of alkoxy and the group -NH.CO.R2, always one of the two substituents X1 and X2 being the group and wherein R2 stands for a member of the group consisting of alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic radical.

4. Rubber products which are colored blue to violet shades containing a water-insoluble monoazo-dyestufi of the following formula:

alkyLO on oo.NH.R,

CO.NH/

wherein R1 stands for a member of the group consisting of hydrogen, alkyl, benzyl, a radical of the benzene and naphthalene series and a hydroaromatic' radical, Y for a member of the group consisting of hydrogen, halogen and alkoxy, and X1 for a member of the group consisting of hydrogen, alkyl and alkoxy.

5. Rubber products which are colored violet shades containing a water-insoluble mono-azudyestufl of the following formula:

CH'O

N 1% w UGO-NH \CO.NH

6. Iwhfloer' products which; ane'-- colored; blue blue shades containing a.:water-insoluble monoshades: containing a; water-insoluble-monowzm azo-dyestufi' of the following formula:

dyestuff of the following formula: 00

7. Rubber products which are coloredreddish- 

